Sculpting the Glutes
The advantage of the stair stepper is that your legs and glutes move through a full range of motion, which is necessary to sculpt your buttocks. The higher the step, the greater the range of motion and the more effective the stair stepper is as a sculpting tool for your backside.
Does the stepper machine make your bum bigger?
If you're looking to firm up your backside, using a stair climber can help. But don't worry — it won't make your butt bigger.
Does the stair stepper activate glutes?
Because the stairmaster imitates the action of walking up stairs, it requires heavy activation from the glute muscles to lift the body as you climb. ... These variations are necessary in order to shape the glutes. So in short – yes, the stairmaster will most definitely lift and tone your glutes.